When the opponent summons a Spirit without paying the cost, except by a Burst effect, this Spirit card in your hand can be immediately summoned, without paying the cost. When you've done so, look at your opponent's entire hand and discard every Brave card.
[LV1][LV2][LV3] Except by Burst effects, neither player can summon Spirit/Brave cards without paying the cost.
Reminder: Adventing a spirit does not count as summoning it.